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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bd941c7bdd481abb01c69c14bc85987a5bfe48c15347904be66239f823bffa' 
  AND token = 'ZOodDbnb/J0I/AEsX4vIYQ/WEEojdLJ9b7TYQvQ9pPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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