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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005bd48b577d1d29ca18a20f3d9e052ef4d743827db2988b5bfac1e70b15fdf9' 
  AND token = 'ekpyHqYmT9O0sAc0ZmKLcaVHsW24nBd7c0ChucsueTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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