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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eec3ab3855bf4c46259ffa51071afe5651a34a5f4948cb3b2662363400c5be' 
  AND token = 'DDcqooRfIpzxnvnLgoMWzaq3Z7QCydaHr8zYON/75m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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