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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa204e9eba423fc439fdf2a25983e82e2a95e69c0990950ffb343aa79deac628' 
  AND token = 'WgRUT/YT+Q6fIDmQm6S/HhqetGVthtqLxlHj8O1YIyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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