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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c474d75d20aeb421c13b8bda70c56903b4e8e13eea278e390b98db932709675' 
  AND token = 'vXSAbLWxZpdSz7j8UjJ11Q57j3VmeGqWMG6BevewYHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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