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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fde11147a3a7593e4ce712482a7f93beb9b44714b7c2c9c016d71c4da52e54' 
  AND token = 'rhNBXSHJ7m/tiPHkMVZ5/thrggWScjoScGAkAnAMk9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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