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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ef60f4a7ebae716b3b8e08d292f62ca4abc4f46b6d66d5340ea575f175dec0' 
  AND token = 'ndsSwlceAGJAwNKVzG2e1JPUrbPleS1VhsoUdjRyAJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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