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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18bd262b9b6b908e3d501029ad4fbb82731108fc8e937ccb3c07dbd739e65f5' 
  AND token = 'U80zWg+RF02AP9ATtoHNUicUq7H9H0li/M/kG+lxp2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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