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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d04cf9a343b5c7771997a993ddd3ad346795045f3564bf15becd5a367325182' 
  AND token = 'c3X5rvbeQu8v+a0RDT1CsPd7MrzpgHuY7XJ/NF0n728=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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