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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b18cf2362a8abae8c2bfa9bf2f807b75601022375822415727a8a58c79c8825' 
  AND token = 'deiFG4WvsaPQ05gUx41CrjAdNcHz7xMP9MajjxhF3aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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