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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a469daacea5251bbef85f252e19df2d0c79784b65f8cf1173f69f59d39f9ee4c' 
  AND token = 'QtszEj4z4fnDcxOD21zLySt++wu6MgmMy0/8RXOcRrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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