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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b23e43f96f6e8730b0986c7115caefcb35dc1e9bd339459ca48d2ebb37fdde' 
  AND token = 'MR/+dfhGKjtiUNPZ6vnSsfUaP1LIcoa3dgaiZtWrux4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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