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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af13bdb3769acea59c9d7a7d8f845008497685920b6c98eaebca488036daa058' 
  AND token = '41jw8G8tILJIlfyq6hXPR2iyj83qvzGEquMdm9GSuZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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