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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a5037869bd34ae20dfd29babf96b5517cbc234ea3c87fb94e01bd2a62a45aa' 
  AND token = 'vJfBqhIaseU6u43jI4QSxwO23FbofaMQz6jnSBzwYmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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