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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070fad51f14d3786292ea32ebf315a5a1f0be32928c4d300791d1893516aa1af' 
  AND token = '20dTBJIACdqrwmOJLh4shTBkG056a7JyhUnqsyTmPJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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