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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d08f269d83c6ca1fc8600421c1bf5d1b2eceabd65b7bd45ed32ad92e5a24b1e' 
  AND token = 'iRH0Uit/cNgw7qmTQAcOFEMjSa+5/gferbvZYo40oDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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