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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2089f4b3982e76d01c0e9ce8cbe9d6a999c2475cc852f8043fe24f63d177b88' 
  AND token = 'xjbt7vv6mtOGnAL9/GoYeMsiQ9FGdZsCZ+GleqUNnSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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