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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd2cb182ff4ec3c467e0f46dc4141b3dfda70a841b6514ab6caa2c19ac8d413' 
  AND token = '5xXse73C5wP39eFQkOVYUkEMQgvY1jd+3WrRM2DnUpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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