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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab089f4783bb5e52a4409e54cd62880dd6a4309f812132b5bf7c64fd0fd7c755' 
  AND token = 'g8s+lF9QE7PY422ChRHqs0A7yce9UXLy8dVGbb4nLkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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