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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df628760af8cf7bd7b39dabd09e8536252077eb914ebed4cb251e67f32e04c4' 
  AND token = 'K31SpKygj9NrCbNi8uawFR9DEab+GzY1PxdN+GJ8leQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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