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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35903c08de372bd8e4702b40384b8284515ab81bc0edcea25a1dc0eb95fd943e' 
  AND token = 'KwDKflICTDED6LDYJEcQcFD75X67v82XcKt6LPSxFVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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