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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1e869c473c7bc3f571c9da8ac0b173a3c16ffb3bf3062559ba56e52607899c' 
  AND token = '6LcOSCZxdSBoS7I58a3yjBhkt5gS5FHHYKE2a3ozhDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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