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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf78bfce4bd3a1dba3fbc0454f359d270f3828a858b0a59f4992c674a0b8dc3e' 
  AND token = '1ozGRS1SMzxVAYuC37jqOydXdsrM65et/msZlre2yb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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