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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1131d3d74faf36f4bd52ec11c56b1595e3fefdf2ebcc43318d97a2b2347e9e0' 
  AND token = 'OqQbSOFppCHtW/4zWyrN7uY0h8ZyhTbm+WM9t3r5Zxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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