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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e659018657707e9e66019de662f7454e511bdd084490da35b5b1ddaa079c6a' 
  AND token = 'WaGUuhpc+KNK6Tch5V5W+mfwrYaHt50R4B2qVUbCJ+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}