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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f91d4bbb8df89b2ba279ceb193f501ae7b13a8205daf2a3de7233a81a1abef' 
  AND token = '6Ee3eLPJzRUNL0mntnd5BD70fHMID85rVCZDSoxYmkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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