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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707fc38ea12906486d010b35d35e50e5e8448b62654f5630554cc0569487a045' 
  AND token = 'SYndV3pNg8tA4GSBYdlt39O2bSki8F3G0zU3dFd11nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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