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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ea19aeab685318512bbd42fc8689ed4c2c6088da6162421fd2e28195cc8427' 
  AND token = '31cS0lv9Q4Fri5unjW4PobMk9Nnh6s6UliCdLw7a8v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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