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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceeb26fe4602fbf770195d1b391df87039da8429baa34466b538c4b5b7fcfc75' 
  AND token = 'dO5phz8ZBJF3tq07gb3m7YuQuYIuDdiW7cA7H6P0CSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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