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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176da098255abfecb18b75a427da0d0d1bcca7038f10d09c797ed68e5adf242d' 
  AND token = 'c4Mn6GAbDDxmWtNluUMwwZ908Aa59bae0Tq3ZsZluaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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