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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63667bbd349f7e389d62a5d15be39c40e15208dc06d27652756040540521e9' 
  AND token = 'h2Z2LP4cIHQBoqnTTz8D0hqzDrEv5LNS9QmN8uXiWKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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