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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd432e110420f69b1244d06ff124ed889c048e00762b5e81063b735070298321f' 
  AND token = 'Yx4uqHx9WattIBrZY/YOG1qfJAtP1YzAVQrja/BVCrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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