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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc66a9baa4bc61b76f2519171e682f960b1f481d3d21f2b2f6e8f5ae75d5c511' 
  AND token = 'SnNVvAjvEkcAhfoQmoZqFFE1cctKiwrkjKK5jHBP/D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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