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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14d21b4a10aa1847f9c02543c581d5dba4eae5f3d7cdf1b1a65374441ac6a6b' 
  AND token = 'IIuK9C2qTQG0aJLqGH6lMTgwIQvWDxkmqV0o5eKdsCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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