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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b493a3eedce0bb46751d02137b34a818d85e28fd8039ad47cbbb9e64f72b1c8' 
  AND token = 'sxOcCemjh+ai8QfBbXNaoVPnEXbG955Bl7VubI2MSXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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