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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca477ef96d35d7bb72bdb8489fc3a64b0ba1203479b4859770350c63324722c0' 
  AND token = '7AOJzZnNj3TznNR1OhNnwK4N3xM2mBz2zhDn8dRzol0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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