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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d977c4929bef518a368a5c34685fdd9ddcf913936f2bfdff7f151f2a49669e' 
  AND token = 'O6XaZoqqwa3/RDvKzH8m7BQ2tc4q6Mp/lYIclFRkB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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