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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8af2cef2b382a4fbf2094179521d5be5443bf5283659f12f7843b16f592ef0' 
  AND token = 'eeceOeMZCmxZd6CldCVl+mrVsj+EF3L2yp3bm/iqmWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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