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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b1b562e6aec438110a2f6acd8ed53941ea3067dfe205be7378c6851f32316c' 
  AND token = 'pRdx7A2nn6DLV96tIjzGiAWJPrGOzqH87dC92wk/YLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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