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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3e8827778cbea41c6d6f62444aea1dfa3aaf9d59d703f700f328b014f69aed' 
  AND token = 'jBlGOoCw0JPjsINoIAwbbWMtV4x/VGjqayt7EeO2ZkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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