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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983a4ec04ed8e8e99fab47774b1a111a4a342305fef55953f8abf20dd2304f89' 
  AND token = '5LWZOuLuFSn/PZ5C2F6ikL6qGto9UnxupgoNgxtR4jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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