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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e741d15fe3e2ce83a3dd458f6a0bfca25d4655a1126be2aeec4e608574527641' 
  AND token = 'xB9KHORHWfM8JSb4Q5fRM7PBL8eoz57whil4ELuptug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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