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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e98d65346ec84c91354ec6e13362f0f1973e78782807b72082807ace23181b4' 
  AND token = 'QFLsZKuAsRE1p2J5jmqQIiVRaDEUIA7HSYNXq23GliI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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