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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69922fb4c6381019397b85aeb95f8016322bc7f2de0579eb8c14ce4e91a05066' 
  AND token = '7+KPtVQQiaGJqvb29vPLn0xEKGxPcvtNNTWRkDK0tRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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