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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2aa493fa334404bec19bafde545a55cc496e4fbaffceacc041b6de8409d152b' 
  AND token = '1v0XiqdQWoiHyyW2ptk/DO5X87/3KEZpe1T832HV6zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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