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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc98b133b339b9ca177ee3f5e3d186dcabb36822a2839fba5db4584ba83f87ba' 
  AND token = 'xYLu1lOB3i0gypESz3XTTMouKaFyLevaVRFk4uK10Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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