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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a947b4a04f3c3e07c7e8c427b6e769e6f03c5e0b5715447bf4460b228bcb2d19' 
  AND token = '6CRjHWI5RG0RgLrhXLPmXa3DuFb+O+WtIjD0M5zsTjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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