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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9d665556b24745013e552e8865fd66b27eade15d41393be9a94ec4f8e6d271' 
  AND token = '/3D7Xlnvhhye6Zoe3Jgc2OB9Yx/Sb08iBHNT0iYK09Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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