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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c78aae11119a8453a56715c12a9ece1abeaa1f9624a1a751e56cd80a63f9a77c' 
  AND token = 'lZSaYMBNu0VMJB4OmDZp9A8Vq/mOL2VSGnxuUU2MN4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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