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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4711268bf700bf172ea218dc74556b87653703cc196ba1801e31eb637090b3a3' 
  AND token = 'J5n3XET9tvX/Ma2WIDuyA23wRkFQV6eNPfoFn187vxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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