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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f675ee74ca619e22539f4453dd7719beecf0238e1158aa0486a5e2399ac7f1e2' 
  AND token = 'vNQxRScW2J3LUIMAtVTM0Uunct1OO3sdtszPdrob1xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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