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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368ab7886886747f854792fe07804e9ea3f998cee193f1e7cde08be9f641d8e5' 
  AND token = 'mm1+1PgCo4LNtnpHBG0Yjl6b1m3ok9wZTZ9Xcvq49D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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