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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6624a6b9db40e57688ee94e7eff563a4081cb5d770996a6194ae2a790675cb22' 
  AND token = 'awyEhju/c2QtpjqTwWKy2fc7Z5G6DjdWwElSIsZiXY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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