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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409431ce2df2ff272040bf31d8c5316df812af340d0e1dcd1df61990c112ce20' 
  AND token = 'czpl+dyieOZ+1vIXahidp0coBpy7nOIHx8gdNgDyho0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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