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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f55df715f0f5264be0b5f7c28b983df115a0d73bdde8df16d6f8b8efc8d9250' 
  AND token = 'NDBQQ+UytMxRkv9addUPVWuwDIFOLvCAbCgqFKSF9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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