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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b84152a4f9aed82d76bf3903e3b9e69200c59967da6d8ac2e851eccf050a4b' 
  AND token = 'FCECF1YtrYQZRda8zjumccRpbT0w7YcuGDvP0u7anGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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