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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '835285ee0b7262430a4747208a71cae6b7e266885beab8e2c39b4c160858b4d8' 
  AND token = 'ajtvg8HIk9aXGUtbdA7nlA1nYs25X13Ah1L9nrd5Q6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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