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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335bbfc8f944dab91f278718fca3ffe1d1cc96866d745a11cc5f64b1907f8003' 
  AND token = 'ZDE+Ga5t+wadJgnPQhyeBmbbS8GsaoPhGl5JxvR+0w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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