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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf78c3653079f4b78a7ef8f2b4a3e573f5eb41472970c92da8e526346f59063' 
  AND token = 'Hkmtds22+y1hzVBsROU8qS4vL7S0eBmwD47MDwk75p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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