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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96cee117b75a4f6651754be342a165d680b9cf9a6e702660f80c2e9e86c7a9f' 
  AND token = '6fL9roaXyQ2dd+pD8lfuVSUramGEznb+n8mYCGNXuYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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