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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65566c1c4f1130dfdba92491d744be91794cd13df481578702b1b7ab70ca2635' 
  AND token = 'BHMpT1tEB+As0vR3suISYvD9iy07zeGKcO/ocOw9BWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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