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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da03b8fca98f185cf48f3e8dd7fe665adf85d76bcbef70d72f4931aec848f16c' 
  AND token = 'caKFUax3xBl048vDbHVRwx8L4mswCoDE+5Ct90KnGak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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