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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1bc219e1c0106b1dd8abb5d28d89e1af197f0756b78e4f1b8add73b52cc7d0' 
  AND token = 'dHMYp7zviq9NCWLkG7+79c3v5d8MaGIG2FpNeVRznok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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