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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a56373ff525ab62f8d7df0c0658e79a43b8c2ba8b719403bee2963aae016302' 
  AND token = 'E+Kes7Sq9YWub88Z10dxlUXwCNZbPJsgAnli18brQGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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