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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7419f7b569117ee4bbfa036dac81076b22234ade4551dfd9faeb3a2e763337f' 
  AND token = 'QBJ2XyxZd/qFAyTfncJgI3RpAiVfGjsZrcttoAUA4/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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