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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0ba064151d7d7593cfde2d05dbede8fb123e04e281e6e137af551b4fc459c5' 
  AND token = 'MnYUYgxbygcKpwyOHd/QhKTo27ycAmfgAdeb4S3I6sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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