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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97e59e590fcbd5d478d8116cc858c2eee0b0bea4160e7ac5ad0eb796ed03286' 
  AND token = 'Dndhk2YvSTqMNxiIQHHOVpxSoGLgfCl+YbXp8V8np4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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