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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91ecf46eeb7d1de9f207af84cac0ad7a488ed910351d1c40c517a0e3826f649' 
  AND token = '87B5W1Vs9eFq9EKlVZhff8DLaPGio9DOJbfKB3IKxqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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