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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3fb560cddb5eaac9cdb265c97df610cb63b867fae2877720b86ac602e29c94d' 
  AND token = 'qZpEH/yBXzODrooTIvmcife28cn5EHYoJI4vSxmBzk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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